Want to improve your mood, productivity and general well-being? Consider turning on a light.

Lighting is such an important factor in mood that even stores and businesses study the impact certain lighting can have on people and their impression of a space. In fact, lighting design is an art and a science. Lighting designers must have an understanding of the visual quality users of a space need for their health, safety and enjoyment.

The Illuminating Engineering Society of North America lists the basic body of knowledge on lighting in the IESNA Handbook. It includes summaries of recommended practices based on research and consensus of successful lighting for specific applications. But individuals don’t need an extensive knowledge of lighting principles to improve their own interior lighting situations. Instead, a cursory understanding of what works can do the trick.

• To create a more pleasant atmosphere, use wall lighting instead of overhead lighting in a space.

• Dim lighting is best for rooms in which relaxation is desired. That is why table lamps are often used with a shade to diffuse the light.

• Homes typically need a combination of lighting sources. An overhead light paired with ambient light and task lighting can help most people get things done.

• According to light bulb manufacturer Sylvania, think in terms of layering light. Light sources should be placed at different heights throughout a room to supply adequate illumination as well as visual interest.

• For those who want to boost mood, consider full-spectrum light bulbs that mimic the spectrum of outdoor light.

• Another easy remedy (during the day) is to simply let more outdoor light in. Keep blinds open wide, especially those that face west and south. Bedrooms with windows facing the east may help people rise with the sun. Skylights can help light shine indoors. There are also sun tubes that help direct sunlight into rooms where skylights cannot be installed.

Remember, bright light can energize a person, so it is important to wind down from a long day by dimming the lights and preparing for sleep in the evening.